package com.lh.facade;


//投影仪
public class Projector {

    private static Projector instance = new Projector();

    public static Projector getInstance() {
        return instance;
    }

    public void on() {
        System.out.println(" Projector on ");
    }

    public void off() {
        System.out.println(" Projector ff ");

    }

    //投影仪焦点
    public void focus() {
        System.out.println(" Projector is Projector ");
    }
}
